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INFLUENCE OF PARTICLES SHAPE, SIZE AND UNIFORMITY OF SANDS ON THE VOID RATIO RANGE AND CONSEQUENTLY ON THE DYNAMIC PENETRATION TESTS RESULTS

Session: Soil Mechanics III / Mécanique des sols III

Michael Ghali, Sherbrooke University (Canada)
Mourad Karray, Sherbrooke University (Canada)
Mohamed Chekirad, Hydro-Québec (Canada)
Varvara Roubtsova, 3Hydro-Québec (Canada)

It has been discussed earlier in the 20th & 21st centuries that the particles shape, size, uniformity, and distribution have great influences on geotechnical properties such as the void ratio range (emax - emin) consequently on the geotechnical tests results. Although this is very well known, a minor progress for studying their effects on the void ratio range has been carried out as a parametric study. this is due to three reasons; first: These parameters are deeply integrated with other parameters such as the relative density. second: There are insufficiency in the most common used techniques to differentiate between these parameters; e.g. in the sieve analysis test, there is failure to differentiate between the real size of particles and the shape effect. Third: The overview has shown that there is no certain quantitative descriptor used in the geotechnical field for the particles shape. This paper presents a literature review on such parameters and initially proposes some solutions for the problem by several techniques such as the Image analysis which seem to be promising tool. correlation between the old and new techniques are also proposed and finally a majority of correlations of (N1)60 with such geotechnical parameters are discussed.